add provider `fireworks.ai`

[zatevakhin]

coz of firepass and other nice things like inference speed

https://fireworks.ai/

[vigsterkr]

@max-amos oh cool! thnx for the link!
i'll add a new documentation as actually you can do something like this in your providers.toml:

[[providers]]
name = "xiaomi"
path = "oci://ghcr.io/querymt/openai:latest"

[providers.config]
base_url = "https://token-plan-sgp.xiaomimimo.com/v1"
api_key = <YOUR API KEY>

basically if you know that the endpoint is 100% openai compatible you can just reuse the openai plugin